Nice controller indeed ...
Maybe you still have room for a hardware minimoog DSP emulation board: check the ASX board from Use-Audio:
http://www.use-audio.com/asx.htm
It could save some PC CPU power (the processing is done by the DSP)
It would provide you a good sounding cheap 12 note polyphonic Minimoog DSP emulation (150 €). You will get also some alternative plug-in you can choose to use when not using the Minimax, the Lightwave, a digital synth providing something inspired from the Prophet VS, The vVocodizer, a rather nice vocoder and the B3000 a B3 emulation. Some other plugs can be bought at a bargain price (99 €) including a Prophet 5 and an Odyssey emulations ...